I guess it all depends on how much you know about eBay. There are a lot of tips in this ebook just as the title suggests and I am sure that most people would learn something from this digest. However if you are looking for really up to date information this may not be your best bet. References to Corey Rudl for example give the game away here because tragically the well known internet pioneer and marketer died in a sports car accident in 2005.
Sometimes an ebook will have some real gems mixed up with fairly average information and I would say that this ebook probably falls in that category.